Scanning Probe Microscopy Investigation of Nonahelicene on Ag(110)
- PC Online Talk
- Date: Apr 29, 2021
- Time: 11:00 AM (Local Time Germany)
- Speaker: Maximilian Halbauer
- FHI Department PC

Scanning probe microscopy [1-3] with the capability of
single-molecule manipulation in combination with tip-enhanced Raman
spectroscopy [4-5] can offer a unique insight to these properties. A STM
and AFM study of nonahelicene ([9]H) on Ag(110) is presented and the
experimental techniques are shortly introduced. The molecular
self-assembly on the surface is presented and highlights the great
control over the local environment. Results from high-resolution imaging
with functionalized and unfunctionalized tips were then used to
determine the conformation, chirality and orientation of adsorbed
[9]H-molecules and to establish the interaction behavior with the
underlying Ag(110)-substrate. Scanning tunneling spectroscopy (STS)
allowed an insight to the electronic structure of the molecule. The
first results of frequency-shift spectroscopy with the qPlus-AFM sensor
are presented, as they offer one opportunity for investigation of the
spring-like properties of helicenes. An overview of the experiments that
are currently in progress and conclusions for future experiments is
given at the end.
[1] J. Repp, G. Meyer, et. al., Phys. Rev. Lett. 2005, 94, 026803.
[2] L. Gross, N. Moll, et. al., Phys. Rev. Lett. 2011, 107, 086101.
[3] L. Gross, F. Mohn, et. al., Science 2009, 325, 1110-1114.
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